WAFFLES

B16A
Mugen Proggy
Timing at 18degrees

Is it safe to run 89 with this set up?

Civic Rs

Knock knock knocking on heavin door

WAFFLES

Are you serious or just joking? Do you have any real experience with this?

kill bill

hahahahahhahah

WAFFLES

I've used 1/2 a tank of it so far and nothing negative yet.

Lsos

You'll at least get less power on a stock b16, but I don't know about it with your setup.

Patch

Your knock sensor will automatically advance your timing. Better octane allows your computer to retard your spark as much as possible. Or maybe its the other way around...

Kamin

please explain this to me
octane dosent mean horsepower.


89 wouldnt be much of a problem but i sure as hell wouldnt run it on a b16.
if that thing starts knocking at 8000 rpm your in trouble.

Cuong-nutz

Don't mean to jack your thread, but running 89 octane is fine with the USDM B16A2 99-00 Si or is 91 recommended?

0554

dude i have been runnin 87 octane in my b16crx for over a year. **** even when i go to the strip i still only put in 87octane. however i have ran super and it still runs the same times at the track.

goforbroke

I remember when I first got my b16a I was putting 87 octane in my car and no lie my car would have a miss on the highway. So after I ran out all the gas on the shitty 87 octane I put 93 octane in it from that standpoint. And I haven't had a problem since then.

VTECVillain

So you have a B16A and the Mugen chipped ECU? That program runs more aggressive fuel and timing maps so running low octane wouldn't be a good idea. If you can afford a swap, hopefully you can afford some good gas to go with it

MPower332TI

Nothing less than 93 octane for me. Especially when youre running 18 degrees of timing,with 89 octane your just asking for spark knock. Spend the extra cash on the 93. I promise you will see a difference. I wouldnt run 89 unless i was at 16 degrees of timing or less. Oh and one more thing. If its a jdm motor is was used to having 104 octane in japan so why would you want to consider 89 especially with that ecu.


[Modified by jDmDxTuRd, 9:57 PM 3/10/2003]

1320straight

I've been on an S2000 runnin' on 89 octane gas... runs fine..

Kamin

sure it will run fine
but all it takes is 1 bad detonation and you will have a brand new window in your block.

Civic Rs

B16A => Here in canada in the manuel book you have to use 91 octanes
Mugen Proggy => No more Knock sensor and more aggressive fuel
Timing at 18degrees => need more octane

Why not pay for 91 octanes and dont take any risk for 1-2$/tank

My 2 cents

Lsos

It sure does when it's causing the knock sensor to retard your timing.

http://www.caranddriver.com/xp/Caranddriver/features/2001/november/200111_feature_gasoline.xml?keywordsctane

Kamin

but thats the COMPUTER causing you to loose power.
not the fuel.
all the fuels make the same power its just how slow/fast they burn.

Lsos

The computer is not causing you to lose power, the computer is merely trying to save the engine. If the computer was not trying to save the engine, then you would still be losing power and your engine would blow up.

You'd never get 160hp out of a b16 on diesel fuel. I don't care what computer program you put in there.

Kamin

yea lets compare diesel to unleaded gas.
thats a good one.

look, in a GENERAL SENSE, the octane of the fuel dosent determine power. you could have 110 octane race gas vs 87 unleaded. if you run them on the same bone stock civic ex. it will make the same power.

WAFFLES

Okay guys here's the lowdown. I ran the whole half tank of gas and had no problems. I later ran a full tank of 89 again and had no problems. I just filled up with my second full tank and have noticed a slight miss at highway speeds like the previous guy mentioned. I usually always run 93 octane, but I'm a broke college student and wanted to see if I could get away with it for a little bit. I am going to either drain what is left and get 93, or I am going to get some NOS octane booster to last me the rest of this tank.


Edit...I also have a First gen B16a motor in my car with no knock sensor anyways. Plus the ecu. I also have a Turbo eclipse fuel pump in my car for more flow.
Thanks for all the input. For anybody who didn't read that...don't use 89 octane on a B16A with advanced timing and a mugen ecu....91 or up only.


[Modified by WAFFLES, 1:10 PM 3/12/2003]

Lsos

Fine. I still maintain, and am willing to put down money on this, that a b16 does not and will never be able to (all else equal) put out the same power on 87 gas as on 93 octane gas. The gas is simply unable to function properly under the conditions that a b16 puts it under. If you try to take full advantage of the engine's design, the gas will detonate. Gas that is detonating is not putting out the same power as gas that is burning properly. It's also messing up the engine.

So you have two choices going from 90+ octane to 87 octane, on a b16.

1. Detonation = damaging to engine and less power
2. Retard timing = less power

Either way, 87 gas on this particular engine WILL make less power than 90+ gas.

Raise the compression even further and you'll see an even bigger difference in power. Maybe in a bone stock Civic ex it won't make a difference, but in a high compression engine it will, and in a b16 engine it does.

type Gendy

maybe thats the reason my car is running like dog *** right now, after going from 93 to 87.......DAMN COLLEGE

Lsos

That's what credit cards are for.

After I saw what difference Sunoco 94 made for my b16 crx, I just tanked up on that stuff religiously. Now I got a job and am paying it off...it was worth it